№2(10) 2018

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The impact of hafnium addition on the properties of heat-resistant nickel alloy SM104
(2018) Kostin, A.; Gladchenko, D.; Костін, О. М.; Гладченко, Д. С.
Improvement of performance properties of heat-resistant nickel alloys remains a pending issue for alloys operating in conditions of high-temperature salt corrosion. Within this context our study examines the impact of hafnium on micro-structure and performance properties of standard heat-resistant nickel alloy CM104 which is widely used in construction of modern marine gas turbine engines. Through computational-analytical method it was determined that the optimal level of hafnium addition shall amount to 1,4 % of the alloy weight. The study included examination of the micro-structure of the alloys, their hardness, plasticity, short-term and long-term strength at a temperature of 900 ºС. It is shown first that hafnium contributes to the grinding of the alloy structure CМ104, it stretches the granules boundaries and increases the amount of volumetric fraction of the γ′- phase. Hafnium addition reduces hardness by 3…5 % on average and increases the plasticity of the alloy, it allows to increase resistance to high-temperature salt corrosion while maintaining short-term and long-term strength at 900 ºС. It will allow to improve the performance properties of heat-resistant nickel alloy CM104 and positively impact its bond-ability.